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MA: Fachverband Magnetismus
MA 40: Frustrated Magnets II
MA 40.10: Vortrag
Donnerstag, 20. März 2025, 17:30–17:45, H20
Localized Magnons in the Generalized Model of the Sawtooth Chain with Dzyaloshinskii-Moriya Interactions — •Vadim Ohanyan1, 2, Johannes Richter3, 4, Michael Sekania5,6, Marcus Kollar7, and Lucas Giambattista7 — 1Laboratory of Theoretical Physics, Yerevan State University, 1 Alex Manoogian, 0025 Yerevan, Armenia — 2CANDLE, Synchrotron Research Institute, 31 Acharyan Str., 0040 Yerevan, Armenia — 3Institut für Physik, Universität Magdeburg, P.O. Box 4120, D-39016 Magdeburg, Germany — 4Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Straße 38, D-01187 Dresden, Germany — 5Reichenzentrum, University of Augsburg, 86135 Augsburg, Germany — 6Center for Condensed Matter Theory and Quantum Computations, Ilia State University, 0162, Tbilisi, Georgia — 7Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
We consider a generalized model of a spin-S sawtooth chain with three distinct exchange couplings and Dzyaloshinskii-Moriya (DM) interactions. The primary focus of our research is on various scenarios for magnonic flat-band formation and the corresponding properties of localized magnons. A general flat-band constraint is derived, which, due to the large number of parameters in the model, allows for a broad diversity of flat-band scenarios. We provide a detailed analysis of different solutions to the flat-band constraint, construct the associated localized magnon states, and study the properties of the one-magnon spectrum.
Keywords: Sawtooth chain; localized magnons; Dzyaloshinskii-Moriya interaction